feat: ImportDialog组件 — 三步骤批量导入弹窗(拖拽上传+预览+执行)

## ImportDialog.vue (新增)
- Step1: 模板下载 + el-upload drag 拖拽上传
- Step2: el-table 预览验证结果(绿色通过/红色失败+错误详情)
- Step3: 确认导入(事务保护), errorCount>0时按钮disabled
- Props: importType ('material'|'bom'), modelValue
- Emits: success (刷新列表)

inventory-web/src/components/ImportDialog.vue

@@ -0,0 +1,315 @@
+<template>
+  <el-dialog
+    v-model="visible"
+    :title="title"
+    width="900px"
+    destroy-on-close
+    :close-on-click-modal="false"
+    :close-on-press-escape="!executing"
+    :show-close="!executing"
+  >
+    <!-- ═══ Step 1: 下载模板 + 上传文件 ═══ -->
+    <div v-if="step === 1" class="step-upload">
+      <div class="template-download">
+        <span class="step-label">1. 下载模板</span>
+        <el-button type="primary" plain @click="downloadTemplate" :loading="downloading">
+          <el-icon style="margin-right:4px"><Download /></el-icon>
+          下载 {{ importType === 'material' ? '基础信息' : 'BOM表' }} 模板
+        </el-button>
+      </div>
+
+      <el-divider />
+
+      <div>
+        <span class="step-label">2. 上传填好的文件</span>
+        <el-upload
+          ref="uploadRef"
+          :auto-upload="false"
+          :limit="1"
+          accept=".xlsx,.xls,.csv"
+          drag
+          :on-change="handleFileChange"
+          :on-remove="handleFileRemove"
+          :file-list="fileList"
+        >
+          <el-icon class="el-icon--upload"><UploadFilled /></el-icon>
+          <div class="el-upload__text">
+            将文件拖到此处，或 <em>点击选择文件</em>
+          </div>
+          <template #tip>
+            <div class="el-upload__tip">支持 .xlsx / .xls / .csv 格式，单文件上传</div>
+          </template>
+        </el-upload>
+      </div>
+
+      <div v-if="previewLoading" class="preview-loading">
+        <el-icon class="is-loading" style="font-size:20px"><Loading /></el-icon>
+        <span style="margin-left:8px">正在解析和验证数据...</span>
+      </div>
+    </div>
+
+    <!-- ═══ Step 2: 预览验证结果 ═══ -->
+    <div v-else-if="step === 2" class="step-preview">
+      <el-alert
+        :title="previewSummary"
+        :type="errorCount > 0 ? 'warning' : 'success'"
+        :closable="false"
+        show-icon
+        style="margin-bottom:16px"
+      />
+
+      <el-table :data="previewRows" border stripe max-height="450" style="width:100%">
+        <el-table-column type="index" label="#" width="50" align="center" />
+        <el-table-column label="状态" width="90" align="center">
+          <template #default="{ row }">
+            <el-tag :type="row.status === 'success' ? 'success' : 'danger'" size="small">
+              {{ row.status === 'success' ? '通过' : '失败' }}
+            </el-tag>
+          </template>
+        </el-table-column>
+        <el-table-column label="错误信息" min-width="200" show-overflow-tooltip>
+          <template #default="{ row }">
+            <span v-if="row.error_msg" style="color:#F56C6C;font-size:12px">{{ row.error_msg }}</span>
+            <span v-else style="color:#C0C4CC">-</span>
+          </template>
+        </el-table-column>
+        <el-table-column
+          v-for="col in previewColumns"
+          :key="col.prop"
+          :prop="col.prop"
+          :label="col.label"
+          :min-width="col.width || 120"
+          show-overflow-tooltip
+        >
+          <template #default="{ row }">
+            {{ row.data?.[col.prop] ?? '-' }}
+          </template>
+        </el-table-column>
+      </el-table>
+    </div>
+
+    <!-- ═══ Footer ═══ -->
+    <template #footer>
+      <el-button @click="handleClose" :disabled="executing">取消</el-button>
+      <el-button v-if="step === 1" type="primary" @click="handlePreview" :loading="previewLoading" :disabled="!fileReady">
+        预览验证
+      </el-button>
+      <el-button v-if="step === 2" type="primary" @click="handleExecute" :loading="executing" :disabled="errorCount > 0 || executing">
+        {{ executing ? '导入中...' : `确认导入 (${successCount} 条)` }}
+      </el-button>
+    </template>
+  </el-dialog>
+</template>
+
+<script setup lang="ts">
+import { ref, computed, watch } from 'vue'
+import { ElMessage } from 'element-plus'
+import { Download, UploadFilled, Loading } from '@element-plus/icons-vue'
+import request from '@/utils/request'
+
+// ═══ Props ═══
+const props = defineProps<{
+  modelValue: boolean
+  importType: 'material' | 'bom'
+}>()
+
+const emit = defineEmits<{
+  (e: 'update:modelValue', val: boolean): void
+  (e: 'success'): void
+}>()
+
+// ═══ State ═══
+const visible = computed({
+  get: () => props.modelValue,
+  set: (v) => emit('update:modelValue', v)
+})
+
+const title = computed(() =>
+  props.importType === 'material' ? '批量导入基础信息' : '批量导入 BOM 表'
+)
+
+const step = ref(1)
+const downloading = ref(false)
+const previewLoading = ref(false)
+const executing = ref(false)
+
+const uploadRef = ref<any>(null)
+const fileList = ref<any[]>([])
+const fileReady = ref(false)
+const rawFile = ref<File | null>(null)
+
+const previewRows = ref<any[]>([])
+const successCount = computed(() => previewRows.value.filter(r => r.status === 'success').length)
+const errorCount = computed(() => previewRows.value.filter(r => r.status === 'error').length)
+const previewSummary = computed(() =>
+  `共 ${previewRows.value.length} 条: ${successCount.value} 条通过, ${errorCount.value} 条失败`
+)
+
+// ═══ Preview Columns (depends on type) ═══
+const materialColumns = [
+  { prop: 'company_name', label: '所属公司', width: 100 },
+  { prop: 'name', label: '名称', width: 120 },
+  { prop: 'common_name', label: '专业名称', width: 100 },
+  { prop: 'category', label: '类别', width: 150 },
+  { prop: 'material_type', label: '类型', width: 90 },
+  { prop: 'spec_model', label: '规格型号', width: 150 },
+  { prop: 'unit', label: '单位', width: 70 },
+  { prop: 'reference_price', label: '参考价', width: 90 },
+  { prop: 'is_inspection_required', label: '强制质检', width: 85 },
+]
+const bomColumns = [
+  { prop: 'bom_no', label: 'BOM编号', width: 140 },
+  { prop: 'version', label: '版本', width: 70 },
+  { prop: 'parent_name', label: '父件名称', width: 120 },
+  { prop: 'parent_spec', label: '父件规格', width: 120 },
+  { prop: 'child_name', label: '子件名称', width: 120 },
+  { prop: 'child_spec', label: '子件规格', width: 120 },
+  { prop: 'dosage', label: '用量', width: 70 },
+  { prop: 'loss_rate', label: '损耗率%', width: 75 },
+  { prop: 'remark', label: '备注', width: 100 },
+]
+const previewColumns = computed(() =>
+  props.importType === 'material' ? materialColumns : bomColumns
+)
+
+// ═══ Methods ═══
+
+const downloadTemplate = async () => {
+  downloading.value = true
+  try {
+    const res = await request({
+      url: '/v1/import/template',
+      method: 'get',
+      params: { type: props.importType },
+      responseType: 'blob'
+    })
+    const blob = new Blob([res as any], {
+      type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
+    })
+    const url = window.URL.createObjectURL(blob)
+    const a = document.createElement('a')
+    a.href = url
+    a.download = `${props.importType === 'material' ? '基础信息' : 'BOM表'}_导入模板.xlsx`
+    a.click()
+    window.URL.revokeObjectURL(url)
+    ElMessage.success('模板下载成功')
+  } catch (e) {
+    ElMessage.error('模板下载失败')
+  } finally {
+    downloading.value = false
+  }
+}
+
+const handleFileChange = (file: any) => {
+  rawFile.value = file.raw
+  fileReady.value = true
+}
+
+const handleFileRemove = () => {
+  rawFile.value = null
+  fileReady.value = false
+  previewRows.value = []
+}
+
+const handlePreview = async () => {
+  if (!rawFile.value) return
+  previewLoading.value = true
+  try {
+    const formData = new FormData()
+    formData.append('file', rawFile.value)
+    formData.append('type', props.importType)
+
+    const res: any = await request({
+      url: '/v1/import/preview',
+      method: 'post',
+      data: formData,
+      headers: { 'Content-Type': 'multipart/form-data' }
+    })
+
+    if (res.code === 200) {
+      previewRows.value = res.data?.rows || []
+      step.value = 2
+    } else {
+      ElMessage.error(res.msg || '预览失败')
+    }
+  } catch (e) {
+    ElMessage.error('文件解析失败，请检查文件格式')
+  } finally {
+    previewLoading.value = false
+  }
+}
+
+const handleExecute = async () => {
+  if (errorCount.value > 0) return
+  executing.value = true
+  try {
+    const res: any = await request({
+      url: '/v1/import/execute',
+      method: 'post',
+      data: {
+        type: props.importType,
+        rows: previewRows.value
+      }
+    })
+
+    if (res.code === 200) {
+      ElMessage.success(res.msg || '导入成功')
+      emit('success')
+      handleClose()
+    } else {
+      ElMessage.error(res.msg || '导入失败')
+    }
+  } catch (e) {
+    ElMessage.error('导入请求失败')
+  } finally {
+    executing.value = false
+  }
+}
+
+const handleClose = () => {
+  step.value = 1
+  fileList.value = []
+  rawFile.value = null
+  fileReady.value = false
+  previewRows.value = []
+  visible.value = false
+}
+
+// 关闭时重置
+watch(visible, (val) => {
+  if (!val) {
+    step.value = 1
+    fileList.value = []
+    rawFile.value = null
+    fileReady.value = false
+    previewRows.value = []
+  }
+})
+</script>
+
+<style scoped>
+.step-upload {
+  min-height: 200px;
+}
+.step-label {
+  font-weight: 600;
+  font-size: 14px;
+  margin-right: 16px;
+}
+.template-download {
+  display: flex;
+  align-items: center;
+  margin-bottom: 8px;
+}
+.preview-loading {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 24px;
+  color: #909399;
+  font-size: 14px;
+}
+:deep(.el-upload-dragger) {
+  width: 100%;
+}
+</style>